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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a29fbd8c460ca875e0579a6af5cdf9afa35a21ff020f87098e17b2c0640f03e0' 
  AND token = 'EgP9pOi3z4XoojtCqH+o7XEdqxB+mG8Bf9ADPjyhQLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}